package org.madao.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.apache.commons.lang.StringUtils;
import org.madao.common.exception.NoStockException;
import org.madao.common.to.mq.OrderTo;
import org.madao.common.to.mq.StockDetailTo;
import org.madao.common.to.mq.StockLockedTo;
import org.madao.common.utils.R;
import org.madao.gulimall.ware.entity.WareOrderTaskDetailEntity;
import org.madao.gulimall.ware.entity.WareOrderTaskEntity;
import org.madao.gulimall.ware.enume.OrderStatusEnum;
import org.madao.gulimall.ware.enume.WareTaskStatusEnum;
import org.madao.gulimall.ware.feign.OrderFeignService;
import org.madao.gulimall.ware.feign.ProductFeignService;
import org.madao.gulimall.ware.service.WareOrderTaskDetailService;
import org.madao.gulimall.ware.service.WareOrderTaskService;
import org.madao.gulimall.ware.vo.OrderItemVo;
import org.madao.gulimall.ware.vo.OrderVo;
import org.madao.gulimall.ware.vo.SkuHasStockVo;
import org.madao.gulimall.ware.vo.WareSkuLockVo;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.madao.common.utils.PageUtils;
import org.madao.common.utils.Query;

import org.madao.gulimall.ware.dao.WareSkuDao;
import org.madao.gulimall.ware.entity.WareSkuEntity;
import org.madao.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;

@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {
    @Autowired
    WareSkuDao wareSkuDao;
    @Autowired
    ProductFeignService productFeignService;
    @Autowired
    WareOrderTaskService wareOrderTaskService;
    @Autowired
    WareOrderTaskDetailService wareOrderTaskDetailService;
    @Autowired
    OrderFeignService orderFeignService;
    @Autowired
    RabbitTemplate rabbitTemplate;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();

        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)){
            wrapper.eq("sku_id",skuId);
        }
        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)){
            wrapper.eq("ware_id",wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1.判断如果还没有这个库存记录新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if(entities==null||entities.size()==0){
            WareSkuEntity skuEntity=new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字
            //1.自己catch异常
            //TODO 还可以用什么办法让异常出现以后不回滚？高级
            try {
                R info = productFeignService.info(skuId);
                Map<String,Object> skuInfo = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode()==0){
                    skuEntity.setSkuName((String) skuInfo.get("skuName"));
                }
            } catch (Exception e) {

            }

            wareSkuDao.insert(skuEntity);
        }else {
            wareSkuDao.addStock(skuId,wareId,skuNum);
        }
    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            //查询当前sku的总库存量
            Long count = baseMapper.getSkuStock(skuId);

            vo.setSkuId(skuId);
            vo.setHasStock(count==null?false:count > 0);
            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 为某个订单锁定库存
     *
     * (rollbackFor = NoStockException.class)
     * 默认只要是运行时异常都会回滚
     *
     * 库存解锁的场景
     * 1)、下订单成功，订单过期没有支付被系统自动取消、被用户手动取消。都要解锁库存
     * 2)、下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。
     *      之前锁定的库存就要自动解锁。
     * @param vo
     * @return
     */
    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {

        /**
         * 保存库存工作单的详情
         * 追溯。
         */
        WareOrderTaskEntity wareOrderTaskEntity = new WareOrderTaskEntity();
        wareOrderTaskEntity.setOrderSn(vo.getOrderSn());
        wareOrderTaskService.save(wareOrderTaskEntity);

        //1.找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();

        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareIds(wareIds);
            return stock;
        }).collect(Collectors.toList());

        //2.锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked=false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareIds();
            if (wareIds==null || wareIds.size()==0){
                //没有任何仓库有这个库存
                throw new NoStockException(skuId);
            }
            //1.如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发给mq
            //2.锁定失败。前面保存的工作单信息就回滚了。发送出去的消息，即使要解锁记录，由于去数据库查不到id，所以就不用解锁
            //
            for (Long wareId : wareIds) {
                //成功就返回1，否则就是0
                Long count=wareSkuDao.lockSkuStock(skuId,wareId,hasStock.getNum());
                if (count==1){
                    skuStocked=true;
                    //TODO 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null,skuId,"",hasStock.getNum(),wareOrderTaskEntity.getId(),wareId,1);
                    wareOrderTaskDetailService.save(entity);
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(wareOrderTaskEntity.getId());

                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity,stockDetailTo);
                    //只发id不行，防止回滚以后找不到数据
                    lockedTo.setDetail(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);
                    break;
                }else {
                    //当前仓库锁失败，重试下一个仓库
                }
            }
            if (!skuStocked){
                //当前商品所有仓库都没有锁住
                throw new NoStockException(skuId);
            }
        }

        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {
        StockDetailTo detail = to.getDetail();
        Long detailId = detail.getId();
        //解锁
        //1、查询数据厍关于这个订单的锁定厍存信息。
        // 有:证明库存锁定成功了
        //      解锁:订单情况。
        //          1、没有这个订单。必须解锁
        //          2、有这个订单。不是解锁库存。
        //              订单状态:   已取消:解锁库存
        //                         没取消:不能解锁
        //没有:库存锁定失败了，库存回滚了。这种情况无需解锁
        WareOrderTaskDetailEntity byId = wareOrderTaskDetailService.getById(detailId);
        if(byId != null) {
            //解锁
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = wareOrderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();//根据订单号查询订单的状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if(r.getCode() == 0){
                //订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {});
                if(data == null || data.getStatus()== OrderStatusEnum.CANCLED.getCode()){
                    //订单不存在
                    //订单已经被取消了。才能解锁库存
                    //为保证幂等性，只有当工作单详情处于被锁定的情况下才进行解锁
                    if (byId.getLockStatus()== WareTaskStatusEnum.Locked.getCode()) {
                        unlockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }
                }
            }else {
                //消息拒绝以后重新放到队列里面,让别人继续消费解锁。
                throw new RuntimeException("远程调用订单服务失败");
            }

        }else{
            //无需解锁
        }
    }

    /**
     * 防止订单服务卡顿，导致订单状态消息一直改不了，库存消息优先到期。查订单状态新建状态，什么都不做就走了。
     * 导致卡顿的订单，永远不能解锁库存
     * @param orderTo
     */
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下最新库存的状态，防止重复解锁库存
        WareOrderTaskEntity task=wareOrderTaskService.getOrderTaskByOrderSn(orderSn);
        //查询出当前订单相关的且处于锁定状态的工作单详情
        List<WareOrderTaskDetailEntity> lockDetails = wareOrderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", task.getId())
                .eq("lock_status", WareTaskStatusEnum.Locked.getCode()));
        for (WareOrderTaskDetailEntity lockDetail : lockDetails) {
            unlockStock(lockDetail.getSkuId(),lockDetail.getWareId(),lockDetail.getSkuNum(),lockDetail.getId());
        }
    }

    private void unlockStock(Long skuId, Long wareId, Integer skuNum, Long detailId) {
        //数据库中解锁库存数据
        wareSkuDao.unlockStock(skuId, skuNum, wareId);
        //更新库存工作单详情的状态
        WareOrderTaskDetailEntity detail = WareOrderTaskDetailEntity.builder()
                .id(detailId)
                .lockStatus(2).build();//变为已解锁
        wareOrderTaskDetailService.updateById(detail);
    }

    @Data
    class SkuWareHasStock{
        private Long skuId;
        private Integer num;
        private List<Long> wareIds;//仓库id
    }
}